fix(bundledDev): print build errors to the terminal when an HMR update fails

packages/vite/src/node/server/bundledDev.ts

@@ -140,6 +140,12 @@ export class BundledDev {
     this._devEngine = await dev(rolldownOptions, outputOptions, {
       onHmrUpdates: (result) => {
         if (result instanceof Error) {
+          this.environment.logger.error(
+            colors.red(`✘ Build error: ${result.message}`),
+            {
+              error: result,
+            },
+          )
           // TODO: send to the specific client
           for (const client of this.clients.getAll()) {
             client.send({

playground/hmr-full-bundle-mode/__tests__/hmr-full-bundle-mode.spec.ts

@@ -1,6 +1,14 @@
 import { setTimeout } from 'node:timers/promises'
 import { expect, test, onTestFinished } from 'vitest'
-import { addFile, browserLogs, editFile, isBuild, page, readFile } from '~utils'
+import {
+  addFile,
+  browserLogs,
+  editFile,
+  isBuild,
+  page,
+  readFile,
+  serverLogs,
+} from '~utils'
 
 const assetUrl = /asset-[\w-]+\.png/
 
@@ -80,10 +88,14 @@ if (isBuild) {
   // BUNDLED -> GENERATING_HMR_PATCH -> BUNDLED
   test('handle generate hmr patch error', async () => {
     await expect.poll(() => page.textContent('.hmr')).toBe('hello')
+    const lastServerLogIndex = serverLogs.length
     editFile('hmr.js', (code) =>
       code.replace("const foo = 'hello'", "const foo = 'hello"),
     )
     await expect.poll(() => page.isVisible('vite-error-overlay')).toBe(true)
+    await expect
+      .poll(() => serverLogs.slice(lastServerLogIndex).join('\n'))
+      .toContain('Build error')
 
     editFile('hmr.js', (code) =>
       code.replace("const foo = 'hello", "const foo = 'hello'"),